You are not getting NIST certified lab quality weights at this price. But for calibrating household scales for the kitchen, brewing, winemaking, jewelry and crafts this is a good set at a good price. As others have published accuracy tables, I will not repeat this information. But after checking the weights with a lab scale, I found that everything was within acceptable tolerance for home use. Milligram weights are essentially small pieces of thick foil. That's what tweezers are for, and you're likely to lose some of them. My 10mg weight - less than 2 square millimeters - quickly disappeared when I first started using it. Come on, I still haven't bought a kit for those tiny scales. Anything 1g and over was fine and easy to handle. I'm a bit confused about the empty hole in the top left corner of the box - it seems the perfect size for a 100g weight, but the kit is only rated for 50g and this hole is left empty. (I wonder if my 10mg weight slipped through the wrong place?) :) But for the price, it's a very comfortable, fairly accurate weight set suitable for calibrating small household scales. I recommend.
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